Fatal error: Class 'SoapClient' not found

Diagnose

Look up the following inside your script file

phpinfo();

If you can't find Soap Client set to enabled like so:

Fix

Do the following:

1. Locate php.ini in your apache bin folder, I.e Apache/bin/php.ini
2. Remove the ; from the beginning of extension=php_soap.dll
3. Restart your Apache server
4. Look up your phpinfo(); again and check if you see a similar picture to the one above
5. If you do, problem solved!

On the other hand if this doesn't solve your issue, you may want to check the requirements for SOAP here. Also in the comment section you can find good advice on connecting to https.

Do you have a php_soap.dll in your php/ext/ folder?

This was a cakephp issue

https://github.com/cakephp/cakephp/issues/8501

$restore = error_reporting(0);
try {
    $soap_client = new SoapClient($wsdl_file, ['exceptions' => true]);
}
catch (SoapFault $e) {
    trigger_error($e->getMessage()); // Overwrites E_ERROR with E_USER_NOTICE
}
finally {
    error_reporting($restore);
}